Projector for page printers



Aug- 6, 1946 R. G. scHuLER PROJECTOR FOR AC'YE PRINTERS Filed'July 17, 1940, 4 Sheets-Sheet 2 Aug. 6, 194e R, G, SCHULER 29495168 PROJECTOR FOR PAGE PRINTERS Filed July 17. 1940 4 Sheets-Sheet 3 FIG. 5

mvElyToR REGINALD G. scHuLER ATTORNEY Aug. 6, 1946.

R. G. scHULER 2,405,168 PROJECTOR FOR` PAGE PRINTERS Filed July 17, 19510 4 Sheets-Sheet 4 FIG. 8 9

8| 77 I8' 82 |94 |79 Il' |96 I l" |97 |73 |49 20o E |87 |75 '74 |76 205 220 203 FIG. 11 ,9| 20, 204 202 |49 208 s L |42 llllllhlllllunnnummlllIlllll ISI Patented Aug. 6, 1946 PROJECTOR FOR PAGE PRINTERS Reginald G. Schuler, Highland Park, Ill., assignor to Teletype Corporation, Chicago,

ration of Delaware Ill., a corpo- Application July 17, 1940, Serial No. 346,003

6 Claims. l

The present invention pertains to printing telegraph projection systems and apparatus and more particularly to combination page printers and projectors for displaying on a screen or inspection area information in enlarged characters.

The primary object of the invention is to provide a page printer-projector wherein the image appearing on the screen includes substantially the last character recorded.

ACCOI'dIlg to the present invention a projection system has been provided which embodies a page printer, of the type shown in U. S. Patent No. 1,904,164, designed to give upon a screen a running account of received message matter, through the instrumentality of an optical system comprising an arrangement of inclined mirrors so that the printer and lamp housing may be located at the lower part of a suitable cabinet, and the screen formed as a part of the upper forward, wall of the cabinet and positioned above the printer compartment,

Specifically, the page printer is mounted on rails supported in a structural frame to which is pivotally mounted the lamp housing, in such manner that the lamp housing with its condensing lenses is positionable so as to embrace within the field of projection the last line of printing, and also to include eight or ten printed lines. Printing is effected on a Cellophane strip and the image of the record produced thereon is projected through the optical system onto the screen. The Cellophane web or strip is drawn upwardly through the projection field. The characters on the section of the web in the projection field are so arranged as to form horizontal lines one above the other, and the images of said horizontal lines of characters are projected on the screen. The horizontal lines of images on the screen move upwardly across the screen similar to the movement of the web through the projection field.

The lamp housing together with the condensing lenses is swingable upwardly about its pivotal articulation with the structural frame to permit ready access to the page printer, so that when the lamp housing is raised, the printer is rendered accessible for servicing.

Further features of the invention reside in proriding a disc platen movable with the type carriage wherein printing is effected on the periphery of the disc and the number of hidden printed characters is reduced to a minimum; and mea-ns for assuring even wear of the platen by automatically rchanging its printing point, incommensurately.

Cil

The foregoing and other objects and features of the invention will appear from the following detailed description taken in conjunction with the accompanying drawings, in which,

Fig. 1 is a perspective view of the projection cabinet with a part of the wall broken away to show schematically the optical and projection system;

Fig. 2 is 'a cross-sectional view of the printerprojector according to the present invention;

Fig. 3 is a perspective View of a stereoptican slide carrier;

Fig. 4 is a modiiied form of delivery means for the supply of record material;

Fig. 5 is an enlarged side View and partial section of the printer mechanism and associated lamp housing and part of the optical arrangement;

Fig. 6 is a View of an alternate form of guiding means for the record material;

Fig. 7 is a view of an alternate form of mounting for the small reector mirror of the projection system;

Fig. 8 is an enlarged cross-sectional view of the printer platen and platen frame;

Fig. 9 is a view taken substantially on line 9-9 of Fig. 8;

Fig. 10 is a top view of the part of the printer mechanism shown in Figs. 8 and 9; and

Fig. ll is an enlarged side view of a type bar head.

Having reference to the drawings in which like reference characters indicate similar parts throughout the several views, the combination page printing and projecting apparatus according to the present invention is housed in a cabinet, indicated generally by the numeral II, which is provided in the lower portion thereof with a door I2, and in the upper portion with a translucent projector screen I3. Secured to the floor of cabinet I! are two angle iron rails I4 (only one of which vis shown in Fig. 1) which provide a track for the frame i5 (Fig. 2) which supports the page printing apparatus, indicated generally by the numeral I6; the lamp housing I'I, and the optical arrangement represented generally by `condensing lenses I8, small .mirrorl I9 and objective lens 2|. Wheels 22 are journaled to the bottom side members of the frame I5 and co-operate in rolling relation with rails i4, which are provided with indentations 23 into which the wheels 2.2 are admitted when the frame I5 in assuming its fully inserted position in the cabinet II, rests upon spacing bosses 25. In the fully inserted position, the frame I5 is anchored by means not lenses I8. A bar 20 (Fig. 6) is pivoted to frame 26 and the lower end of said bar is provided with a hook portion (not shown) which, when the frame 26 is swung upwardly about pivots 24 tok facilitate removal of the printer for servicing, is held in its upward position by the engagement of said hooked portion with a stud, in well-known manner, the bar 29 thus serving as a brace or support. The lamp housing I1 comprises an outer casing 21 (Fig. 2) which is secured to a plate 28 fastened to a crossbar 29 of the frame 26. Contained within the lamp housing I1 and suitably spaced from the outer casing 21 thereof is a baie plate 3| which rests upon the bottom of the housing I1 and extends upwardly kto a point close to the top as illustrated in Fig. 2. The bottom of the housing I1 is provided, between the outer casing 21 and the bafe plate 3|, with apertures 32. This construction permits the flow of convection currents between the outer casing 21 and the baffle plate 3| for cooling purposes.

Housing I1 is provided with a cover 33 having a grilled section 34 covered by a meshing if desired. Depending from the cover 33 and spaced therefrom is a baffle plate 36 (Fig. 2) of substantially the same area as the opening 34. 'I'.o protect the condensing lenses I8 from the heat of lamp 31, the bottom of the housing I1 may be cut away as at 38. Lamp 31 is adjustably clamped te a bracket 39, which in turn is adjustably supported by the floor of the housing |1 A reilector 4| is spring clamped by a carrier 42 which is adjustably supported, through the instrumentality of a rod 43 and the enlarged mounting holes for plates 45, by the outer casing 21 of the lamp housing I1.

In the embodiment of the invention shown in the drawings, a condensing lens system I8, comprising two plano-convex lenses and one convexoconvex lens, is provided, these lenses being suitably clamped by clamps 44 to plates 28, 46 and 41 .l

which are appropriately separated by spacing posts (not shown). Plate 41 is secured along its top edge to a crossbar 48 (Fig. 2) of frame 26. Plates 28, 46 and 41 are suitably apertured to p-rovide a eld of projection of such area as to present upon the screen I3 (Fig. 1) a predetermined number of lines of printing produced on the record strip or web 49 of transparent material.

IAs previously mentioned, the optical system of the present invention includes a mirror I9 and an objective lens 2|. The optical system also includes a mirror 5| (Fig. 1) supported in the upper part of the cabinet II, and through this system the image is projected upon the screen I3, The mirror I9 is adjustably pivoted on a pair of standards 52 by means of which its angular position may be determined.l Moreover, standards 52 are adjustably mounted on brackets 53 secured to frame I5. The objective lens 2| is adapted to be adjustably clamped by a clamping band 54 which is supported on a U-shaped bracket 56, .which in turn is secured to a crossbar 51 on frame I5, Thus, the adjustable mountings provided for the mirror I9 and the objective lens 2| facilitate the proper positionment of the image on the screen.

Mirror 5I is supported at three points to minimize, or even eliminate the possibility of injury to the mirror due to a twisting action. Mirror 5I is secured to the cabinet I I through the instrumentality of a bracket 58 located centrally of the bottom edge of the mirror. At each of the upper corners of mirror 5I is provideda bracket 59 by means of which the mirror is secured to the roof Of cabinet I i. Mirror 5| is in the form of a regu- -lar trapezoid, with the shorter of the parallel sides positioned contiguous to bracket 58, The trapezoidal shape of the mirror 5| conforms to the effective shape of the field of projection at the .angle at which mirror 5I is placed in cabinet I i.

Mirror 5I, so shaped, produces a rectangular visual field or field of projection on screen I3, which accordingly is of rectangular conformation.

The projection screen I9 is composed of translucent material so as to permit an image to be projected on to it from the rear and be visible from the front of the screen.

A blower or exhaust fan 14 (Fig, 1) is located at the upper part of the cabinet II and is positioned behind the mirror 5|. Blower 14 is so mounted that its exhaust port projects through an aperture 16 in cabinet I I, and is suitably supported in said cabinet.

Having reference to Fig. 2 a page printer of the type shown in U. S, Patent 1,904,164 is mounted in the frame I5. The printer indicated generally as I6 has been mcdied in certain respects to adapt it for use with the projector of the present invention. Thepage printer comprises the side frames 19 and 'i9 (Fig. 5) to which is pivoted at 8| a platen frame indicated generally as 82. The usual cylindrical form of platen has been dispensed with in the present embodiment of the invention and has been substituted by the disc form of platen |13 shown in Figs. 8, 9, and 10 and which will be hereinafter described.

To provide a running account of the message printed on the page material a delivery mechanism is provided which comprises a means for permitting the record material to escape from the supply roll, suitable guides, and a web pulling means whereby the page material is advanced through the printing Zone. The page material 49 in being withdrawn from the roll 83 is directed over a slack bar 84 which is pivoted at 95 and is normally biased clockwise by a, spring 89 to maintain the page material or Cellophane web taut between the roll 89 and a hanged cylindrical guide 81 carried on a shaft 99 journaled in plates 89 depending from side frames 18 and 19. The

'web 49 is then directed over a roller 9i to which is fixed a ratchet wheel 92, the ratchet wheel and roller being carried on a shaft 93 journaled in the plates 89 secured to side frames 18 and 19. Cooperating with the roller 9| is a pressure roiier 94 which is carried on a standard 99 secured to a rock shaft 91.. Pressure roller 94 is drawn into pressing relation with roller 9| by means of a spring 98. Secured to rock shaft 91 and located in juxtaposition to plate 89 is a pressure roller release lever 99. Cooperating with lever 99 is a shoulder IGI on plate 89 arranged so that when lever 99 is actuated counterclockwise (as viewed in. Fig. 5) against the action of spring 98 it will latch up behind or on the left-hand side of the shoulder IDI thereby releasing the pressure roller 94 from engagement with pressure roller 9| and maintaining this condition, until lever 99 is again released from the shoulder |9I to permit spring 98 to bring roller 94 again into pressing relation with roller 9|. Associated with the ratchet Wheel 492 is a pawl member |02 (Fig. 2) which ispivoted 'to a bell crank lever |03 carried on a pivot shaft |04. The depending arm of bell crank |03 is pivoted to one end of a push rod |06, the other end of which is shouldered to cooperate with a function bail |08 in the manner shown in the aforementioned patent 1,904,164. Thus, in response to a predetermined selection, a function lever, similar to function lever |01 shown in Fig. 5, is selected to raise the free end of push bar |06 upwardly into the path of the function bail blade |08. Then, when the push rod |05 is actuated leftwardly by the function bail |00, clockwise rotation is imparted to bell crank lever |03 to impart in turn, downward movement to p'aWl |02. In this manner, the ratchet wheel 92 is rotated clockwise one step, which vthrough the cooperation of pressure rollers 9| and v94, acts in cooperation with a web pulling device to deliver a predetermined amount of record material 49 from the supply roll 83 to the printing zone and the projection area.

The record material 49 is brought to the printing position by means of a pulling or drawing mechanism now to be described. The record material 49 as it leaves roller 9| Yis directed around guide rods |09, Ill and ||2. These guide rods may take the form of a fixed rod carrying guide rollers thereon to eliminate friction. From the guide rod I2 the record material 49 is directed vertically through the printing zone and projection field to a guide rod |3 carried by a U-shaped shifting 'frame member 4 (Figs. 2 and 5) pivotally Vcarried on pivots |5 suitably journaled in the frame |5. The page material 49 is then directed around a guide rod ||1 carried in supports ||8 (Fig. 5) depending from bars ||9 secured to angle iron cross bars 2| and |22 of frame I5. From thence, the page material 49 is directed around a spindle |23 fixed to a shaft |24 journaled in standards |26 supported on said bars H9.

Shaft |24 is interconnected through a friction clutch |21 to a pulley |28. Continuous counterclockwise rotation (as viewed in Fig. 5) is imparted to pulley |28 through the instrumentality of a belt |29 connected to a pulley |3| fixed to the main operating shaft |32 of the page printing apparatus shown in Patent 1,904,164. Shaft 32 carries a gear |33 which meshes with a pinion gear |34 fixed to shaft |35 of a motor |36 (Fig. 2). Motor |35, therefore, through gears |34 and |33, shaft |32, pulley |3|, and belt |29 imparts continuous rotation to pulley |28 which through the friction clutch |21 imparts a constant torque through shaft |24 to spindle |23. With this arrangement the page material 49 is maintained in a. taut condition between the spindle |23 and the roller 9|. Thus, when the ratchet 92 is rotated one step a predetermined amount of the page material 49 is delivered from the supply roller 83, which material is immediately taken up by the spindle |23 to preserve the taut condition of the page material.

As disclosed in the aforementioned Patent 1,904,154, the page printer i6 is controlled telegraphically by a selector magnet |31. This is connected in a signal line (not shown) on which are impressed code combinations of signalling impulses. The code signals control, through a selector magnet |31 of a sword and T-type selector (not here shown, but illustrated and described in said patent), a series of selectorl vanes |38 which in turn controls through a series of bell Ycranks 6 (as yshown in said patent) a set of curved code vbars |4| (Fig. 5). Code bars |4| and said bell cranks are supported Yon a movable type carriage, indicated generally by thve numeral 42, which is provided with rollers '|43 and |44 whereby it is adapted to travel on tracks |45Aand |46, respectively, positioned between side frames 18 and i9. Cooperating with code bars are a plurality of pull bars |41 having individuall springs |48. Pull bars |41 are operatively connected by rack and pinion connections to a corresponding plurality of type bars |49 pivoted on a shaft |'5|.

Type carriage |42 is also provided with a spacing rack |52 which cooperates with a spacing mechanism (not shown) similar to that illustrated in Patent 1,904,164, to control the movement of type carriage |42 to form character spaces, tending in this movement to wind up a carriage return spring mechanism (not shown). Upon receipt of the carriage return signal, a function lever (similar to .lever |01) is selected and the carriage return mechanism actuated in the manner described in the aforementioned Patent 1,904,164. A pull bar bail |53 is mounted in the type carriage |42 and is provided with a roller |54 carried on the bottom side thereof on a stud |55. Roller |54 operates between a pair of blades |56 and |51 of a main printing bail |56 so that bail |53 can be reciprocated by bail |58 in any character spacing position ofthe type carriage 42. Fas# tened to the printing bail |58 is one end of a printing spring |59, the other end of which is connected to a printing blow adjustment means as shown in Patent 1,904,164. Bail |58 is mounted on a shaft 6| on which is also carried a printing bail actuator |62 which cooperates with a printing cam |63. Actuator |62 carries 'at the end of its upper arm a stud |64 which has abutting relation only with printing bail |58 and is not permanently connected thereto, which is to permit spring printing. Printing bail |58 is also provided with a. pair of arms |66 which carry a function lever bail |99. Also carried on shaft |61 is a function bail comprising arms |65 and |61, Arm |65 is provided with a follower roller which cooperates with a function bail cam |68, 'and arm 61 supports on its end the function bail blade |08.

Associated with the selector Vanes |30 are la plurality of function levers |01 mounted on pivot rod '|1| and provided with individual springs |12 which tend to rotate the function levers clockwise into registry with the selector vanes |38. The function levers |91 rare normally held out of engagement with the selector vanes |38 by means of the rod |69 of the function lever bail.

As previously mentioned, the platen frame 82 is pivotally supported on pivots 8| in side frames 18 and 19. The platen comprises a circular disc '|13 (Figs. 5, 8, 9 and 10) rotatably mounted on a carriage 1-4 which is slidable cn rods |15 and |16 carried by platen frame 82. Platen carriage |14 is connected to the type carriage, as will be presently described, so as to be movable therewith, the effective printing edge of the platen |13 being located coincident with the printing point or zone determined by the path of operation of the type bar |49.

The platen frame 82 is adapted to be rocked from the letters or unshiit position to the figures or shift position in the manner fully set forth in the aforementioned Patent 1,904,164. Briefly, the side frame of the platen frame 82 (as shown in Fig. 5) is provided with a lug |11 which operates between two adjustable stops |18 and |19. Adjacent to lug |11 there is pivoted to the side frame of the platen frame 82 on pivot 8|, the upper end of a link |82, the lower end of which is pivoted to the horizontal arm of a bell crank lever |83 pivotally mounted at |84. To the lower end of the depending arm of bell crank |83 is pivoted a push bar |85, the free end of which overlies a leftwardly directed arm of the function lever |01. Push bar |85 is also provided with a shoulder |86 which cooperates with the function bail blade |88. The platen frame 82 and platen |13 are shown in Figs. 5 and 8 in the letters or unshit position, with the stop lug |11 against the upper stop screw |18. This condition is achieved when the function bail blade |08 has operated upon the shoulder |86 to move the push bar |85 leftwardly to rotate the bell crank |83 clockwise, thus raising the link |82 to .cause the platen frame 82 to rock clockwise.

A correspondingly similar construction is provided for the figures or shift mechanism. That is a shift function lever similar to lever |91 is provided which when selected is caused to rotate clockwise to bring its rearwardly extending arm into operation to raise a push bar, similar to bar |85, into the path of the function bail blade |08 which, when it is permitted to operate leftwardly (as viewed in Fig. will cause a bell crank, similar to bell crank |83, to pull down a link similar to |82 to rock the platen frame 82 counterclockwise to bring its stop |11 against the lower stop screw |19. The platen frame 82 is maintained in its shift or unshift position by a spring actuated detent member |81 acting on a detent roller |88.

In Figs. 8, 9 and l0 is illustrated the manner in which the platen carriage |14 is connected to the type carriage |42 so as to be movable therewith. As previously mentioned the platen carriage |14 is slidably supported on rods |15 and |16. Carriage |14 is provided with an eccentric stud engaged by the forked end of a bar |89, the left end of which (as viewed in Fig. 9) is secured to a member |9| which is secured by screws |92 to the type carriage |42. As viewed in Fig. 10, the circular platen |13 is rotatably mounted on the platen carriage |14 by means of an eccentric means |93. By means of the adjustment |93 the platen |13 is adjustable toward and away from the record material to vary the clearance therebetween. Rightward and leftward adjustment as viewed in Figs. 9 and l0, is also provided for the platen |13, through the instrumentality of the eccentric adjusting means |90.

An important feature of the present invention is the provision of a platen so positioned as to reduce to a minimum the obstruction of the projected image by the platen. To achieve this result the platen |13 is tilted with respect to the record material printed upon, sufficiently to clear the light cone. The peripheral surface of the .platen |13, upon which printing is effected, is slightly beveled so that in one of the shift positions of the platen the peripheral surface of the platen will be parallel to the record material. In the present embodiment the peripheral surface of the platen |13 is parallel to the record strip when the platen frame 82 has been shifted to the upper case position as indicated in'Fig. 8 by the dotted line |94 or the platen |13.

To compensate for this arrangement of the platen |13, the type faces on the type bar |49 are arranged as shown in Fig. ll. Moreover, this arrangement of type faces in cooperation with a shield |95 (Fig. 8) serves (as will presently appear) to prevent smudging during the printing operation. As is well known, the type bar |49 is provided with an upper case type face |96 and a lower case type face |91 (Fig. 11). However, according to the `present invention the lower case type face |91 is provided with a slope corresponding to the slope of the periphery of the platen I 13 when in the lower case position. The dimension 291 of the upper case type |96 is arranged to be slightly less lower than the minimum height 2 i0 of the lower case type |91. When printing is effected in the lower case position, the type face |93 being lower-than the type face |91, will not touch the record material and hence no smudging of the .printed record will occur.

When printing is effected in the upper case position, means is provided for preventing the lower case type face |91 from coming into direct contact with the surface of the record material. To achieve this result a shield is provided which is adapted to be interposed between the type face |91 and the platen |13 when printing is being effected in the upper case position. Shield 95 is secured to the ribbon oscillating member |99, which, as described in the aforementioned Patent 1,904,164, oscillates the inking ribbon into and out of the path of the type faces during the printing operation. The ribbon oscillator |99 is pivotally articulated to arm 20| of a lever 202 which in turn is pivoted at 283 to a lever 204 pivoted at 229 to the type carriage |42. Lever 204 is arranged to carry a roller 205 which rides on the bottom side of a rail 206 mounted on the platen frame 82, as disclosed in the aforementioned Patent 1,904,164. Roller 205 is pressed against the rail 206 by a spring (not shown), so that when the platen frame 82 is rocked between the shift and unshift positions, roller 285 Will constantly contact with said rail 295, and lever 202 will be reciprocated therewith. i

The depending arm 298 of the lever 202 is operably associated with the pull-bar bail |53 (Fig. 2) so that the reciprocative motion of bail |53 will cause the oscillation of the lever 292 about pivot 203, whether the platen frame 82 is in the shift or the unshift position. Thus, when the bail |53 is in its normal position (the leftward position as shown in Fig. 3), the lever 202 will .iold the inking ribbon, through the instrumentality of the ribbon guide (not shown) located at the upper extremity of member |99 (Fig. 8), in its downward position to effect visibility of the printed character. When the bail |53 moves rightwardly for a printing operation, the ribbon will be raised to printing. position due to the counterclockwise movement imparted to the lever 202 by the bail |53. When the platen frame 82 is in the position shown in Fig. 8, which is the lower case printing position, the shield |95, upon oscillation of lever 202, will not be raised sufficiently to be interposed between the type face |91 and the platen |13. However, when the platen frame 82 is in the upper case printing position with the platen |13 in printing relation with the upper case type face |96, the shield |95 will, upon reciprocation, be raised so as to become interposed between the lower case type face |91 and the record material, thus preventing any ink which has accumulated on the type face |91 from smudging the record material.

As illustrated in Figs. 8, 9 and l0 there is provided a platen rotator for automatically changing the printing point of the platen |13 in response to each carriage return operation. As previously described, the platen |13 spaces with 9 the type carriage |42, and accordingly is spaced step-by-step for character spacing and, upon reaching the end of the line, the platen |13 is returned rapidly with the carriage |42 to the beginning-of-line position. In contact with the platen |13 at a point opposite to the printing point is a closely wound coiled spring 200 which is connected at its ends to the side frame members of the platen supporting frame B2, in such manner that the platen |13 is caused to rotate as it advances during character spacing. Moreover, upon the rapid return movement of the platen |13 (under the influence of the carriage return spring |50) during the performance of the carriage return function, the platen |13 will, owing to the combined sliding and rolling relation with the yieldable spring member 200, rotate incommensurately, thus causing the same printing point of the platen to -be presented to the type bars a minimum number of times. In other words, through the instrumentality of the platen rotator` 233, the platen |13 is controlled in such manner as to reduce to a minimum the number of times any particular printing point on the platen is impinged upon, thereby reducing to a minimum the wear at any given point and hence prolongingr the life cf the platen. In lieu of the coiled spring.

20.3, a taut wire or cord can, of course, be used.

Modifications In Fig. 3 is illustrated a stereoptican slide carrier 30| which may be employed with the printerprojector apparatus of the present invention. To appropriate angle iron members of the frame I5 are secured cross bars 302 and 303, between which is suitably supported a post 304 on which is swingably mounted the slide carrier 30|. Slide carrier 30| comprises hinge members 385 and 3% engaging the post 304. A pair of side members 391 and 308 are secured to the members 335 and 366 in such manner as to define a projection area S89. To the members 305 and 306 are secured a pair of spring members 3|I and 3|2, respectivelyy having their overhanging edges so conformed as to provide grooves to receive the stereoptican slides. The resiliency of the spring clips 3| and SI2 will serve to hold the stereoptican slide in place securely. The lower hinge member 306 is provided with a pair of notches 3 3 which cooperate with a spring actuated detent r pawl 3M, to retain the slide carrier in its loading 'and its projecting positions.

An alternate form of record material delivery mechanism by means of which the record material may be withdrawn from the supply roll 83 (Fig. 5) is shown in Fig. 4. This mechanism comprises an escapement means controlled by the line feed mechanism of the printer. Specifically, an escapement wheel 3|5 is substituted for the ratchet wheel 92 and is fixed to shaft 03. Cooperating with the wheel 3|5 is a double escapement pawl 3|6, pivotally carried on a pivot 3|0. A link 3|? is connected at one end to the pawl 356 and at the other end to one arm of a bell crank lever 3 I8, comparable to line feed bell crank |03, shown in Fig. 2'. Hence the bell crank lever 3 I3, in the alternate form, is substituted for lever |03, and is carried on pivot |04. The line feed push bar 06 is articulated to the bell crank lever 38, the actuation of which, through bar |06, is similar to the manner previously described. With the form of the invention shown in Fig. 4, the shaft 93, and hence escapement wheel 3|5, constantly tends to rotate due to the pull imparted to the record material 49 by the spindle e; 328 in frame l5.

10 |23. Thus, for each reciprocal operation of the push bar |06, the pawl 3|6 will be oscillated to permit the record material to escape one unit of length' corresponding to the line feed distance.

Another method of directing the record material 49 through the projection fieldis illustrated in Fig. 6. In this view, that portion of theY platen frame 82 is shown which carries the platen carriage |14 on rods |15 and |13. The platen is shown in operative relationship with the type bar |49. The supply roll of record material is positioned above the frame. l5 as is the take-up mechanism comprising spindle |23, and the record material is directed downwardly on the platen side, as viewed in Fig. 6, and is guided around guide rods 32| and 322, and then directed upwardly on the type-bar side to the take-up mechanism in the manner shown in Fig. 5 of the principal form of the invention. An inking ribbon (not shown) is disposed between the type-bar |40 and the record material 40 in the usual manner. The form of guiding means shown in Fig. 6 can be used with. either transparent or opaque record material. When transparent material is utilized, the portion which is directed downwardly does not interfere with the message to be projected which' is printed on the upwardly directed portion.

In Fig. 7 there is shown an alternate method of mounting theY small reflecting mi-rror I9, which comprises pivotally mounting the mirror I9 at the point of pivotal articulation 323 between links 325 and 325, the opposite ends c-f whichare adapted to be adjustably supported in slots 321 and The point 323 of support of mirror |51 is adjustable universally by manipulating the adjusting screws in slots 321 and 3128. Moreover, the angle of the mirror I9 is readily adjustable through the medium of clamping screws at pivot 323.

It is, of course, manifest that the features herein disclosed may be modified without departing from the spirit and scope of the present invention, which is intended to be limited only as set forth in the appended claims.

What is claimed is:

1. In combination, a printing device, a type carriage movable to form character spaces, means for directing record material through said device comprising means for guiding said material in a vertical plane above and adjacent to said type carriage, means for producing a printed record on said record material comprising a rotatable platen, said platen comprising an inverted conical frustum, said frustum tiltably positioned so that its peripheral surface adjacent said record material is substantially parallel to said record material, whereby a minimum portion of said platen is exposed to the field of projection, means effective under certain operating conditions to change the rotational position of said platen incommensurately, and means comprising a projection system for projecting onto a screen images of the characters produced on said record material.

2. In combination, a printing device having a type carriage movable to form character spaces and a platen, said platen comprising an inverted conical frustum, said frustum tiltably positioned adjacent a web so that its peripheral surface nearest said web is substantially parallel thereto, whereby a minimum portion of said platen is exposed to the field of projection, means for drawing said web through said device comprising a pulling device disposed beyond the exit end of ll said vertical-projection field which is located immediately above and includes said platen and delivery means positioned in advance of said platen, and means comprising a projection system for projecting onto a screen images of the character produced on said web.

3. In a projector having a stationary Vertical projection eld, means for directing a web through said projection field, a printing device comprising a type carriage and a rotatable platen, said platen comprising an inverted conical frustum, said frustum tiltably positioned adjacent the web so that its peripheral surface nearest the web is substantially parallel thereto, whereby a minimum portion of said platen is exposed to the field of projection, means for advancing said carriage to form character spaces, carriage returnV means, means for rendering said platen movable with said carriage, and means effective upon each operation of said carriage by said carriage return means to change the rotational position of said platen incommensurately.

4. In a projector, means to project rays of light, a stationary projection eld illuminated by said rays of light, means for directing a transparent web twice across the same light rays, said means including means for causing said web to retrace its path so that confronting planar surfaces thereof are disposed in face to face alignment, and a printing device comprising a type carriage and platen for producing a printed record on said web as it passes in one direction through said eld without affecting the operative relationship between said projection field and said web as the latter passes in the opposite direction through said field.

5. In a projection system, a framework, a lamp housing and condensing lens system supported on said framework to project rays of light, a telegraph receiver mounted in said framework in cooperative relationship with said lamp housing and lens system, a web directing means so arranged with respect to said receiver and lens system as to provide a vertical projection field illuminated by said rays of light, recording means in said receiver for producing lines of printing on a transparent web in said projection field, means for directing said web twice across the same light rays rst downwardly then upwardly so that confronting planar surfaces of said web are disposed in face to face alignment, and to direct said lines of printing, which are produced upon the upwardly moving section of the web, in an upward direction across said projection field without interfering with the printed record, and mirrors and an objective lens cooperating with each other so as to produce upon a screen an image moving thereacross in correspondence with the movement of the web through said projection field.

6. In combination, a projector having a vertical projection iield, a light source and condensing lens system to illuminate said field, means for directing a web through said field, a printing device comprising a type carriage and a rotatable platen movable therewith, said platen comprising an inverted conical frustum, said frustum tilted to correspond with the angularity of the side of the light cone and positioned adjacent the web so that its peripheral surface nearest said web is substantially parallel thereto, whereby a minimum portion of said platen is exposed to the field of projection, means for moving said carriage, means responsive to the movement of said carriage for rotating said platen incommensurately, and means comprising a projection system for projecting onto a screen images of the character produced on said web.

REGINALD G. SCHULER. 

